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o Extraction of hexavalent chromium from soil matrix: <br /> Method 3060 <br /> o Analysis for total chromium in extract solution: Method <br /> 7190 <br /> o Analysis for arsenic in extract solution: Method 7060 <br /> o Analysis for hexavalent chromium in extract solution: <br /> Method 7196 <br /> o Analysis for copper in extract solution: Method 220. 1 (as <br /> specified in "Methods for Chemical Analysis of Water and <br /> Wastes" , EPA-600/4-79-020, U. S . Environmental Protection <br /> Agency, 1979) <br /> Detection limits, based on 10% of the arithmetic mean of the <br /> concentrations of chromium, hexavalent chromium, arsenic and <br /> copper identified in the background soil , will be used. The <br /> detection limits are as follows : <br /> o Chromium 2 mg/kg <br /> o Arsenic 0 . 5 mg/kg <br /> o Copper 2 mg/kg <br /> PHASE II - INTERMEDIATE AND DEEP SUBSURFACE PROGRAM <br /> The residual material on the bottom of the pond will be monitored <br /> to determine its ability to support the weight of the <br /> all-terrain drill rig supplied by Layne Environmental Services. <br /> The rig weighs approximately 22 , 000 lbs. when fully tooled. <br /> GMI <br /> 10 <br />